I'm currently running the TriboDyn 20W-50 racing oil and TriboDyn 75W-90 gear oil along with TriboDyn TriEx2 grease. Running this combination has made my car easy to roll around the shop and at the track. At the end of every season, I tear down the engine to see what's going on with it and to refresh it. I ran 19 races in 2015 on just 1 oil change with no problem at all. The engine ran nearly 30 degrees cooler this year even with the excessive heat in the hot summer months.
I also have a 2010 Cummins 1 ton for a work truck that I use the TriboDyn 15W-40 diesel engine oil in and I've gained over 3 mpg. That's HUGE for a truck that only gets around 12 mpg as is.
I can't say enough good things about TriboDyn, I highly recommend their products to any racer and diesel truck owners.